7145534412221 has 16 divisors (see below), whose sum is σ = 7530469689600. Its totient is φ = 6766820417280.

The previous prime is 7145534412199. The next prime is 7145534412223. The reversal of 7145534412221 is 1222144355417.

It is a de Polignac number, because none of the positive numbers 2^k-7145534412221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7145534412223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9219611 + ... + 9964551.

It is an arithmetic number, because the mean of its divisors is an integer number (470654355600).

Almost surely, 2^{7145534412221} is an apocalyptic number.

It is an amenable number.

7145534412221 is a deficient number, since it is larger than the sum of its proper divisors (384935277379).

7145534412221 is a wasteful number, since it uses less digits than its factorization.

7145534412221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749116.

The product of its digits is 268800, while the sum is 41.

Adding to 7145534412221 its reverse (1222144355417), we get a palindrome (8367678767638).

The spelling of 7145534412221 in words is "seven trillion, one hundred forty-five billion, five hundred thirty-four million, four hundred twelve thousand, two hundred twenty-one".